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Old 12-26-2013, 09:22 PM   #1
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Dash heater blower not working

I have an Itasca 33v 2006 with a Ford chassis.

The blower motor quit operating. The fuse for the high speed had blown. Replaced it and everything was fine. Next day no fan speeds worked at all. Can anyone help me to get this fixed? Fuses appear to be good.

Thanks, Bill
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Old 12-26-2013, 09:43 PM   #2
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Fan switch is likely the cause if fuse is good. Remove the fuse and clean/sand/scrape the connections. Can you pull the switch from the dash to check connections. Use a small wire to jump the teminals on the switch. Good luck
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Old 12-26-2013, 10:20 PM   #3
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It could be the resistor pack that controls the fan speeds. It is usually built into the heater box so moving air cools the resistance coils. (multiple wires attached, one for each speed) If one of the resistance wire coils burns or breaks, it could short out.
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Old 12-27-2013, 03:00 AM   #4
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Does your fan switch have three or four distinct speed settings? or feels like a volume control on your sterio? if you have the latter there is a speed controll module mounted in the evap case under the hood. This module will have four or five wires and can be had at the ford dealer for about $80.
If your fan switch has three or four distinct speeds you have the resistors that bob talks about. I don't think there is anything wrong with the resistors as high speed bypasses the resistors and feeds 12v strait to the fan motor. The fan switch controlls the ground side of the motor so you can check at the motor for 12v when the key is on and ac or heater is turned on. If you have 12v to the motor try jumping a ground wire to the other leg on the connector to the motor and see if it works.
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Old 12-28-2013, 07:03 PM   #5
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With my fooling around before you responded I blew the fuse for the front furnace (meaning the underfloor heater coil heated by the engine antifreeze fluid circulating thru it to then pump air thru it into the coaches duct system to heat while driving). Can't find a fuse anywhere for this. yep I did it myself and as soon as I caused the ark by unintentional grounding of the 12 volts at the relay post for this front floor heating system I knew I had screwed up. Where in the world could that fuse be as none of the fuses in the under dash or under hood area either have any blown fuses?
Thanks, Bill
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Old 12-28-2013, 07:22 PM   #6
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Quote:
Originally Posted by fulltime fun View Post
With my fooling around before you responded I blew the fuse for the front furnace (meaning the underfloor heater coil heated by the engine antifreeze fluid circulating thru it to then pump air thru it into the coaches duct system to heat while driving). Can't find a fuse anywhere for this. yep I did it myself and as soon as I caused the ark by unintentional grounding of the 12 volts at the relay post for this front floor heating system I knew I had screwed up. Where in the world could that fuse be as none of the fuses in the under dash or under hood area either have any blown fuses?
Thanks, Bill
The fuses for house 12 v are usually a separate panel, perhaps near your converter/charger. The water pump, refrigerator, interior lights, etc. are usually on the same panel.
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Old 12-28-2013, 07:26 PM   #7
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Thanks. Found one labeled front furnace. It is a pop out button type. Not popped though. Even so no voltage at the relay post. Yuk!
Thanks for your help, Bill
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Old 12-28-2013, 07:36 PM   #8
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The dash blower motor works when jumped. But nothing works thru the dash mounted switch.
Thanks, Bill
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Old 12-29-2013, 03:47 AM   #9
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Quote:
Originally Posted by fulltime fun View Post
With my fooling around before you responded I blew the fuse for the front furnace (meaning the underfloor heater coil heated by the engine antifreeze fluid circulating thru it to then pump air thru it into the coaches duct system to heat while driving). Can't find a fuse anywhere for this. yep I did it myself and as soon as I caused the ark by unintentional grounding of the 12 volts at the relay post for this front floor heating system I knew I had screwed up. Where in the world could that fuse be as none of the fuses in the under dash or under hood area either have any blown fuses?
Thanks, Bill
If you are talking about the ''coach heater'' , on my moho it is the same fuse as the backup cam and display. it is a green 30a fuse on the top right side of the under dash fuse panel located to the left of the steering wheel.
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Old 12-29-2013, 10:44 AM   #10
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Most RV makers use Evans controls and parts for the HVAC. I found the identical control I have and emailed them. They don't sell retail, but they did tell me other vehicles that used that control. I got one at a salvage yard out of a Dodge pick-up.
Evans Tempcon, Inc
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